Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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Sensor not working on my craftsman half horse garage door opener.

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Make sure the sensors are pointed at one another. Each has a small light that must be lit and not flickering. Tweak them a bit. If you cannot get both lights to come on you need to replace the sensors.

Posted on Sep 07, 2010

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The remotes opens the door when we leave. The remote will not close the door. Only the wall button will close-we have to hold it down until it is fully closed. Craftsman 1/2 horse 41A5021-3H


Check your door sensors. Make sure they are pointed at one another and the small light on each one is lit and not flickering. Tweak them a little. If you cannot get both lights to work you have a bad sensor.

Jan 01, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opener won't close. travels 6-8 in.,


If you cannot get the light on the sensor to come on by tweaking it,making sure it is pointed at the other sensor and your wiring is not broken or shorted then your sensors need to be replaced.

Jan 08, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opens randomly then closes


This is most commonly caused by a bad wall control, the wires going to it or a remote with a shorted switch. You must use a process of elimination. Heavy dew or rain will not cause this.

Oct 09, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

How do you reprogram a sears garage door keyped half horse maybe 10 years old


On the rear of your motor unit just to the left of all those white wires you will find the smart/learn button. Press and immediately release this and then key in your new four digit PIN and press enter on your keypad..

Aug 24, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Motor works but does not move chain on half horse sears


Clutch? need more info.. wall mount or overhead? If it's wall mounted it could be the clutch, I don't think overheads have a clutch though. The first thing I'd do is get on a ladder and see if the chain is still attached to the sprocket... good luck

Feb 17, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door will not open properly


You might have a broken spring. Check on the a the header above the door there should be a tube with a drum on each end and 2 springs (maybe one) towards the center. If one of the springs has a gap (1-2 inches) in it. If it does you will need to call a door company in your area. I recommend you replace both springs. If you need to get you cars out some times you can help the operator to lift the door by lifting the door while the operator is lifting the door. Be very careful not to get your fingers in a pinch point and be sure to lower the door the same way.

Feb 01, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opener does not work correctly


Make sure the door springs on the door are ok.Unhook the opener from the track by pulling the red handle rope on the track,make sure the door moves up and down freely.There is a up-force adjustment on the end of the opener that the small wires run to,you will see 2 slotted adjuster screws,find the one labeled up force,turn it clockwise a little bit(1/16th of a turn).Also there is a plastic gear inside the case that gets dry,unplug the opener,remove the 8 screws that hold the case on and lube it with a lithium grease,see if it is worn badly while you have the case off.

Feb 18, 2008 | Sears Craftsman LiftMaster Chamberlain...

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